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Final Fantasy III (DS)
A little over 200 hours on my main file! And yet I only just got everyone to level 99 not too long ago...and there are still plenty of jobs for me to master.
Chrono Trigger (DS, sadly)
30+ hours on my main file, but plenty more time spent on New Game+...it's a shame you can't keep a grand tally or anything.
Final Fantasy V (GBA)
50 hours on my main file, and some time on other files. I haven't finished the bonus content yet (and probably won't anytime soon), so there's plenty more to go.

I've probably clocked well over 100 hours on each of my Pokemon games, barring White.

Whoa whoa what? Those two games took me 60-80 hours to complete, along with all the achievements. After that there's little else to do other than kill Deathclaws and stuff.

You should see my mods folder. A World of Pain, Fortune Canyon...there are so many quest mods/large area mods with Vegas that make it fantastic to keep playing through. I wish there were more of those for 3, I've only found a few good ones (Alton, IL comes to mind).
Plus I play with multiple characters, so.
AND ED-E. OH GOD I LOVE HIM. <3

Batman: Arkham Asylum
Had a run through on all difficulty levels and spent a fair amount of time in challenge mode.Batman: Arkham City
Played the story through on Easy and Normal, started a Game + playthrough and have dabbled in the challenge mode.Halo: Reach
Campaign run throughs, firefight frenzy and multiplayer madness.Kingdoms of Amalur: Reckoning.
Current, and first, playthrough clocking in at 114 hours thus far - only stopped because I felt the need to play something else.

Pokemon Emerald
Pokemon Diamond
Devil Survivor Overclocked
Final Fantasy Tactics Advance
Spyro 2: Ripto's Rage (I don't have official numbers in front of me, but I beat that game a couple dozen times during my lifetime. One time I got 100% completion in one sitting)

EDIT: And Final Fantasy IV I guess. I've played it on so many different consoles that it definitely adds up to 100 hours. SNES, PS1, GBA, DS, and PSP. It's not my favorite game, but it's my "comfort" RPG that I can play over and over again and not get bored of even though I have the story memorized off by heart.

Team Fortress 2, Garry's Mod and Magic: The Gathering - Duels of the Planeswalkers 2012 (despite the latter being a buggy piece of ragequit fuel) are the ones that Steam says I've had. (Between Left 4 Dead and L4D2 I've racked up 100 hours on that series). For other things... I'll have to check, but I can guarantee I've pissed away at least 100 hours on Pokemon White.